> At 04:39 PM 19/05/98 +0200, you wrote:
> >...
> >>  Note that if you do NOT use a transformer, then you will have a
> >>triangle-type output and will not be able to ground the center point
> >...
> >I have distant plans of a small wind power plant.
> >I have been thinking about a 400V 3-phase generator like this:
> >DC input is +340VDC, GND/Neutral, and -330VDC
> >Switching stages are one pair IGBT(or something) for each phase, conecting
> >to +, -, or both off.
   ^^^^^^^^^^^^^^^^^^^^ Gulp. What is going to filter that ? Do you know
what happens if you put an inductive load on such a 'phase' ? Seriously,
to anyone looking into high power electronics, take a GOOD look at such
trifle things like 5 % distortion on a 1 kW sinwave (which works out to a
"mere" 50 Watts turned instantly into HV by any coil impedance in the
circuit, such as a transformer, and ready to fry any semiconductors in the
consumer circuits, and send EMI to Australia, China and who knows where
else in the long wave range ;).

Peter